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Finding the Fourth Proportional to 1,361.92, 1,879.44 and 772.57

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Solution

The fourth proportional to 1,361.92, 1,879.44 and 772.57 is: 1,066.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,361.92 : 1,879.44 = 772.57 : x
  2. Step 2: Convert to fraction form
    1,361.92/1,879.44 = 772.57/x
  3. Step 3: Cross multiply
    1,361.92x = 1,879.44 × 772.57
  4. Step 4: Simplify right side
    1,361.92x = 1,451,998.96
  5. Step 5: Solve for x
    x = 1,451,998.96/1,361.92
  6. Step 6: Final answer
    x = 1,066.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.